How to force a factory reset or hard reset on Micromax devices

Micromax Vdeo 3 Micromax Vdeo 3
Micromax Vdeo 4 Micromax Vdeo 4
Micromax Vdeo 5 Micromax Vdeo 5
Micromax Spark Vdeo Q415 Micromax Spark Vdeo Q415
Micromax Dual 5 Micromax Dual 5
Micromax Brahat 2 Q402 Micromax Brahat 2 Q402
Micromax Canvas Evok Note E453 Micromax Canvas Evok Note E453
Micromax Canvas Evok Power Q4260 Micromax Canvas Evok Power Q4260